using UnityEngine;

/// <summary>
/// 物体高亮效果：鼠标悬停时切换 Emission 或轮廓材质。
/// 挂在可交互的 3D 物体上。
/// </summary>
public class HighlightEffect : MonoBehaviour
{
    [Header("高亮设置")]
    [SerializeField] private Color _highlightColor = Color.yellow;
    [SerializeField] private float _highlightIntensity = 0.5f;

    [Header("可选 - 使用 Outline 组件")]
    [SerializeField] private bool _useOutline = true;
    [SerializeField] private float _outlineWidth = 0.02f;

    private Renderer[] _renderers;
    private Material[] _originalMaterials;
    private Material[] _highlightMaterials;
    private bool _isHighlighted;

    [Header("考核高亮 - 始终显示")]
    public bool AlwaysHighlighted;

    private void Start()
    {
        _renderers = GetComponentsInChildren<Renderer>();
    }

    private void OnMouseEnter()
    {
        if (_isHighlighted) return;
        SetHighlight(true);
    }

    private void OnMouseExit()
    {
        if (AlwaysHighlighted) return;
        SetHighlight(false);
    }

    public void SetHighlight(bool on)
    {
        _isHighlighted = on;
        if (_renderers == null) return;

        foreach (var r in _renderers)
        {
            if (r == null) continue;
            foreach (var mat in r.materials)
            {
                if (on)
                {
                    mat.EnableKeyword("_EMISSION");
                    mat.SetColor("_EmissionColor", _highlightColor * _highlightIntensity);
                }
                else
                {
                    mat.DisableKeyword("_EMISSION");
                }
            }
        }
    }

    /// <summary>闪烁效果，用于提示用户点击</summary>
    public void Flash(float duration = 0.5f)
    {
        StopAllCoroutines();
        StartCoroutine(FlashRoutine(duration));
    }

    private System.Collections.IEnumerator FlashRoutine(float duration)
    {
        float half = duration / 2f;
        SetHighlight(true);
        yield return new WaitForSeconds(half);
        SetHighlight(false);
        yield return new WaitForSeconds(half);
        SetHighlight(true);
        yield return new WaitForSeconds(half);
        SetHighlight(false);
    }
}